CVE-2026-22990Network attack vectorHinoki check available

Kernel panic via malformed Ceph OSD map

Published Jan 23, 2026 · Updated Jan 23, 2026

Reachable assertion in Linux Kernel allows remote attackers to panic a host through a malformed incremental Ceph OSD map. In libceph's osdmap_apply_incremental(), an unexpected epoch value reaches BUG_ON() instead of invalidating and rejecting the map. An authorized peer in an established Ceph session must supply the map; successful exploitation crashes the kernel without reported data disclosure.

CVSS severity7.5
High
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Reachable assertion in Linux Kernel allows remote attackers to panic a host through a malformed incremental Ceph OSD map. In libceph's osdmap_apply_incremental(), an unexpected epoch value reaches BUG_ON() instead of invalidating and rejecting the map. An authorized peer in an established Ceph session must supply the map; successful exploitation crashes the kernel without reported data disclosure.

The record

CVE
CVE-2026-22990
Published
Jan 23, 2026
Updated
Jan 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-617, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4b106fbb1c7b841cd402abd83eb2447164c799ea
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6348d70af847b79805374fe628d3809a63fd7df3
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6afd2a4213524bc742b709599a3663aeaf77193c
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6c6cec3db3b418c4fdf815731bc39e46dff75e1b
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9aa0b0c14cefece078286d78b97d4c09685e372d
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d3613770e2677683e65d062da5e31f48c409abe9
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e00c3f71b5cf75681dbd74ee3f982a99cb690c2b

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4b106fbb1c7b841cd402abd83eb2447164c799ea; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6348d70af847b79805374fe628d3809a63fd7df3; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6afd2a4213524bc742b709599a3663aeaf77193c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6c6cec3db3b418c4fdf815731bc39e46dff75e1b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9aa0b0c14cefece078286d78b97d4c09685e372d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d3613770e2677683e65d062da5e31f48c409abe9; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e00c3f71b5cf75681dbd74ee3f982a99cb690c2b

Published CVSS scores

7.1Red HatCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.5kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo